Method For Production Of Polyester Resins Containing Nanodispersed Nanoscale Additives As Binders For Coating Powers

Abstract

The invention relates to a method for production of polyester resins containing nanodisperse nanoscale additives as binder for powder paints, whereby firstly at least one precursor compound for nanoscale solid particles to be formed is added to the reaction starting materials during the resin synthesis and distributed in the reaction starting materials. The precursor compound(s) which may be reacted at a temperature between 30′ and 260° C., preferably between 80° and 250° C., are reacted to give the desired nanoscale solid particles under the effect of a reaction temperature in the range between 30′ and 260° C., preferably between 80′ and 250° C., the nanoscale solid particles thus formed being nanodispersedly distributed in the polyester resin.

1 . A method of making polyester resins containing nanodispersed nanoscale solid particles as binders for coating powders, wherein initially at least one precursor compound to nanoscale solid particles to be formed, that is miscible with the reaction starting materials, is introduced into the reaction starting materials in the course of the resin synthesis and is dispersed in the reaction starting materials and that the precursor compound(s) capable of being reacted at a temperature between 30 and 260° C., preferably between 80 and 250° C., is(are) reacted under the influence of synthesis temperature in the range between 30° and 260° C., preferably between 80° and 250° C., resulting in formation of the desired nanoscale solid particles, with the nanoscale solid particles thus produced being distributed in a nanodispersed manner in the polyester resin. 
   
   
       2 . The method of  claim 1  wherein the precursor compound(s) are introduced in the beginning phase of the resin synthesis. 
   
   
       3 . The method of  claim 1  wherein the reaction of the precursor compound(s) is carried out under the influence of water portions added to the reaction starting materials or in the presence of water of reaction present during the time of synthesis. 
   
   
       4 . The method of  claim 1 , wherein organic or inorganic metal or metalloid compounds are used as precursor compounds. 
   
   
       5 . The method of  claim 4  wherein copper, silver, titanium, zirconium, aluminum, vanadium, tin and/or silicon compounds are used as precursor compounds. 
   
   
       6 . The method of  claim 4  wherein precious metal compounds, e.g. (currently amended) gold compounds, are used as precursor compounds. 
   
   
       7 . The method of  claim 4  wherein metal or metalloid salts of organic acids, particularly (hydroxy-) carbonic acids, are used as precursor compounds. 
   
   
       8 . The method of  claim 7  wherein metal or metalloid citrates, oxalates or gluconates are used as precursor compounds. 
   
   
       9 . The method of  claim 4  wherein metal or metalloid alkoxylates are used as precursor compounds. 
   
   
       10 . The method of  claim 9  wherein the metal or metalloid alkoxylates that can be used as precursor compounds correspond to the general formula R n X(OR′) −n  in which
 X=Si, Ti(IV), Zr(IV), Al, Va(III), Va(V)   R=a non-hydrolyzable substituent, perhaps furnished with one or more groups, for example epoxy, hydroxyl, carboxyl   m=5 for Va(V); =4 for Si, Ti(IV), Zr; =3 for Al, Va(III)   n=[≦n≦(m−2)]   R′=alkyl.   
   
   
       11 . The method of  claim 9  wherein one or more complexing agents are added to the metal or metalloid alkoxylates that can be used as a precursor compound, in order to limit their hydrolytic sensitivity. 
   
   
       12 . The method of  claim 11  wherein diketones, including their derivatives such as acetylacetone, is/are used as complexing agents. 
   
   
       13 . The method of  claim 11  wherein (hydroxy-) carbonic acids are used as completing agents. 
   
   
       14 . The method of  claim 13  wherein the (hydroxy-) carbonic acid is citric acid.